Since I connected the chest strap to the watch for the first time, the heart rate measurement of the watch alone (when the chest strap is not connected) is no longer correct. What could be the reason for this?
Before that, the watch's measurement was quite accurate.

Question

Since I connected the chest strap to the watch for the first time, the heart rate measurement of the watch alone (when the chest strap is not connected) is no longer correct. What could be the reason for this? 
Before that, the watch's measurement was quite accurate.

Answer

My experience is that the pulse is very accurate at rest, but there are big differences during sport. I notice it especially when cycling, where the heart rate belt is connected to the Edge 1000. There is sometimes a difference of up to 20 beats...

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Question about Garmin Forerunner 935

Since I connected the chest strap to the watch for the first time, the heart rate measurement of the watch alone (when the chest strap is not connected) is no longer correct. What could be the reason for this? Before that, the watch's measurement was quite accurate.